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Question by Chimera3D · Jun 14, 2012 at 03:30 AM · physicsdistancefloatraycasthit

Physics.Raycast Help

Is there reason why this isn't working? I'm not getting anything for the length1 variable. (I have declared a length1 variable elsewhere in the code[this is the only part that matters])

  function Update() {
         
         var fwd = transform.forward;
         
         if(Physics.Raycast (transform.position, fwd, 50)){
             length1 = Physics.RaycastHit.distance;
         }
         
         Debug.DrawRay(transform.position, transform.forward, Color.green, length1);
     
         
     }

Ok thanks! Now I have another question, how can I get this to work?

 function Update() {
     var lineRenderer : LineRenderer = GetComponent(LineRenderer);
     var fwd = transform.forward;
     var hit: RaycastHit; // declare a RaycastHit variable...
     // and pass it to the Raycast function:
     if(Physics.Raycast(transform.position, fwd, hit, 50)){
         length = hit.distance; // then get the result from the hit variable
     }else
         length = 100;
         
     lineRenderer.positions[1].z = length;
 }
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Answer by TehWut · Jun 14, 2012 at 03:37 AM

Hmm I had a problem like this a while back.

I'm guessing that length1 aint working because you never declared the raycast hit in the raycast (did I say that right?) so you would want something more like this.

 var hit:RaycastHit;
 if (Physics.Raycast(transform.direction,fwd,hit,50))
      length1 = hit.distance;
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avatar image Chimera3D · Jun 14, 2012 at 03:50 AM 0
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Thanks but I have another question.

avatar image TehWut · Jun 14, 2012 at 03:54 AM 0
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what exactly is not working?

avatar image Chimera3D · Jun 14, 2012 at 04:20 AM 0
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Nvm, I got it working.

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Answer by aldonaletto · Jun 14, 2012 at 03:40 AM

You must pass a reference to a RaycastHit variable to get the results:

function Update() {

 var fwd = transform.forward;
 var hit: RaycastHit; // declare a RaycastHit variable...
 // and pass it to the Raycast function:
 if(Physics.Raycast(transform.position, fwd, hit, 50)){
     length1 = hit.distance; // then get the result from the hit variable
 }
 // NOTE: I suppose this instruction should be inside the if:
 Debug.DrawRay(transform.position, transform.forward, Color.green, length1);

}

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